Automatic lathe attachment.



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Patented May 22, I900. .1. P. BROPHY, AUTOMATIC LATHE ATTACHMENT.

(Application filed July 17, 1899.)

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a 5 l HH n M Patented May 22, I900. J. P. BROPHY. AUTOMATIC LATHEATTACHMENT.

(Application filed July 17, 1899.) (No Model.) 2 Sheets$heei 2.

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JOHN P. BROPHY, OF CLEVELAND, OI-IIO, ASSIGNOR TO THE CLEVELAND MACHINESCREYV COMPANY, OF SAME PLACE.

AUTOMATIC LATHE ATTAol-im EMT.

srnorrroarrou forming part 01' Letters Patent No. 649,907, dated May 22,1900.

Application filed July 1'7, 1899- Serial No. 724,094. (No model.)

To (tZZ whom it may concern.-

Be it known that 1, JOHN P. BROPI-IY, a citizen of the United States,and a resident of Cleveland, county of Cuyahoga, and State of Ohio, haveinvented a new and useful 1mprovementin Automatic Lathe Attachments, ofwhich the following is a specification, the principle of the inventionbeing herein explained and the best mode in which I have contemplatedapplyingthat principle so as to distinguish it from other inventions.

My invention relates to attachments for automatic lathes, andparticularly to an attachment which may be secured in the turret of suchlathe and caused to cut an undercut or interior groove in a bore.

Said invention consists of means hereinafter fully described.

The annexed drawings and the following description set forth in detailcertain mechanism embodying the invention, such disclosed meansconstituting but one of various mechanical forms in which the principleof the invention may be used.

In said annexed drawings, Figure I represents a top plan of my improvedattachment mounted in a turret and showing also the headstock and aportion of the frame of an automatic lathe and a blank in partialcrosssection, and Fig. 11 represents a similar view illustrating therelation of the parts when not operating upon the blank.

The headstock A is provided with suitable blank-gripping means and isrotated, as required, by suitable mechanism, as is well understood bythose familiar with this class of machinery.

Upon the end of the shank of the attachment B, which is secured in oneof the toolholding apertures of the intermittently reciprocating androtating turret C, is secured a tool holder or frame B. Upon the outerend of this frame is secured a plate Z), in which is formed a tool-seatb, inclined to the axis of rotation of the blank gripping and rotatingmeans-that is, the head-stock A. In said tool-seat is located a movabletool D, whose movement is limited in its backward movement by a pin clpassing through a slot 12 formed in the plate I), said tool beingactuated by a spring I), which engages said pin to move or tend to movethe tool toward the turret and away from the blank to assume theposition shown in Fig. II. The opposite end of said tool engages bycontact the inner end of an adjustable screw 6, secured in the end of anarm E, pivoted upon the toolholder, contact being maintained between thetwo contact-surfaces, when the device is in the position shown in Fig.II, by means of a spring 6, arranged to exert a less amount of pressurethan that exerted by spring I). The opposite end of said arm E isprovided with a roller e journaled so as to permit a portion of theperiphery of the roller to remain free.

In operating the device the lathe mechan ism is so timed that the turretrotates so as to bring the above-described attachment into a positionsuch that upon its subsequent advance the tool in the holder will enterthe blank at the proper point, clearing the metal until the cutting edgehas penetrated the bore to the required distance. On reaching thedesired point the roller 0 contacts the end of the head-stock and on thecontinued advance of the tool-holder causes ,the arm E to turn upon itspivot and project the tool toward the inner surface of the bore in anangular direction, as shown in Fig. I, the cutting edge thereby formingan undercut or angular recess or groove. Such operation is continued tothe required point by the further advance of the tool-holder and thetool then withdrawn, such withdrawal effecting the reverse of the aboveoperation.

Other modes of applying the principle of my invention may be employedinstead of the one explained, change being made as regards themechanismherein disclosed, provided the means covered by either of thefollowing claims be employed.

I therefore particularly point out and distinctly claim as myinvention 1. The combination of blank gripping and rotating means, atool-holder, a tool mounted upon said holder and movable in a directioninclined to that of the axis of rotation of the blank, rotating means,means for moving said holder in the direction of said axis, and an armpivoted upon said holder and adapted to engage said gripping androtating means wheretuate it in a direction opposite that of the actionof said spring, means for advancing said tool-holder toward the rotatingmeans, one end of said arm so located as to engage means fixedrelatively to said holder, whereby said arm is caused to engage andactuate said tool, substantially as set forth.

Signed by me this 5th day of July, 1899.

J. P. BROPI-IY.

Attest:

D. T. DAVIES, A. E. MERKEL.

